[Feature Request] Add configurable editor option for Ctrl+G shortcut

Found 2 possible duplicate issues:

1. https://github.com/anthropics/claude-code/issues/14916
2. https://github.com/anthropics/claude-code/issues/9889

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Adding detailed context from #18990:

Problem: Ctrl+G auto-detects installed IDEs rather than respecting EDITOR/VISUAL environment variables. With Cursor IDE installed, pressing Ctrl+G launches the full IDE just to edit a few lines of prompt text—extremely heavyweight when I have EDITOR configured to use a lightweight text editor.

Proposed solutions:

1. Respect EDITOR/VISUAL environment variables for Ctrl+G (consistent with Unix conventions)
2. Add a dedicated setting in ~/.claude/settings.json (e.g., "promptEditor": "/usr/bin/vim")
3. Both—use the setting if present, fall back to env vars, then fall back to IDE auto-detection

Use cases:

• Users with multiple IDEs who want lightweight editors for quick prompt edits
• Users who prefer terminal-based editors (vim, nano, emacs)
• Users on resource-constrained systems where launching a full IDE is slow

See #18990 for the full write-up.

https://github.com/anthropics/claude-code/issues/18990#issuecomment-3940128383
already posted in the other issue but worth repeating here:

i managed to build a good solution:
https://github.com/gradigit/claude-pager
by using a shim like claude-pager, you can set ctrl-g to whatever editor you want, and i have it setup so you set it within your claude settings.json intuitively.

i know it's still a shim and a workaround, but claude-pager also resolves the issue of claude code window going blank when you ctrl-g.

as a bonus, because i use ctrl-g a lot, i made a purpose-built prompt editor specifically for ctrl-g, focused purely on performance:
https://github.com/gradigit/turbodraft

now im able to ctrl-g and start typing immediately in ~50ms, with full session context.

You can already configure this: the Ctrl+G external editor honors your $VISUAL environment variable first, then $EDITOR. For example export VISUAL="code --wait" (or nvim, zed --wait, etc.) in your shell profile, or put it in the env block of your Claude Code settings so it applies only to Claude Code. See https://code.claude.com/docs/en/interactive-mode (the Ctrl+G row) and https://code.claude.com/docs/en/settings#environment-variables

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